Parse error: syntax error, unexpected 'if' (T_IF) in /opt/lampp/htdocs/testphp.php on line 30 code example

Example 1: Parse error: syntax error, unexpected 'if' (T_IF) in /opt/lampp/htdocs/testphp.php on line 30

if (isset($_POST['submit']))

Example 2: Parse error: syntax error, unexpected 'if' (T_IF) in /opt/lampp/htdocs/testphp.php on line 30

if (isset($_POST['submit']))

Example 3: Parse error: syntax error, unexpected 'if' (T_IF) in /opt/lampp/htdocs/testphp.php on line 30

if (isset($_POST['submit']))